Which of the following resources would you probably use seismic, sonar, and satellite technologies to locate?
a.) natural gas
b.) manganese
c.) salt
d.) sand

A.) natural gas

Natural gas is the resource which can be located by the technologies like seismic, sonar and satellite technologies. The seismic wave are transferred into the suspected site and the sensors record the reflected back waves from the earth. These sensors detect the presence of natural gas. Sonar uses the principle of echo in this method the sound waves are send underwater to locate the natural gases present below the earth crust. Satellite technology uses the principle of remote sensing in which the land surveying occurs and here also the sensors detect the presence of natural gas.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.